astronomical day

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We may remark that the commencement of the astronomical day commences twelve hours after the civil day.

From Astronomical Myths Based on Flammarions's History of the Heavens by Blake, John F.

One of the objects of the third resolution is to make the new universal day coincide with the civil day rather than with the astronomical day.

From International Conference Held at Washington for the Purpose of Fixing a Prime Meridian and a Universal Day. October, 1884. Protocols of the Proceedings by Various

A diurnal motion exactly fills an astronomical day or the time of one rotation of a planet on its axis, while a daily motion is much less definite.

From English Synonyms and Antonyms With Notes on the Correct Use of Prepositions by Fernald, James Champlin

To find at any hour desired what star will cross your meridian, take the R.A. of the Mean Sun for Greenwich Mean Noon of the proper astronomical day.

From Lectures in Navigation by Draper, Ernest Gallaudet

A diurnal flower closes at night; a diurnal motion is precisely coincident with the astronomical day.

From The Century Vocabulary Builder by Bachelor, Joseph M. (Joseph Morris)